diff --git a/strops.c b/strops.c
index c1ff2f6..81e7248 100644
--- a/strops.c
+++ b/strops.c
@@ -67,7 +67,7 @@ ull_t strops_first_pos_of_char(const char* string, char char_to_search) {
 }
 
 ull_t strops_first_pos_of_string(const char* string, const char* string_to_search) {
-    char contains_string;
+    bool_t contains_string;
     ull_t sts_length = strops_length(string_to_search);
     ull_t l = strops_length(string) - sts_length + 1;
     ull_t i, j;
@@ -86,7 +86,7 @@ ull_t strops_first_pos_of_string(const char* string, const char* string_to_searc
     return i;
 }
 
-char strops_contains_char(const char* string, char char_to_search) {
+bool_t strops_contains_char(const char* string, char char_to_search) {
     ull_t i;
     for (i = 0; i < strops_length(string) + 1; i++) {
         if (string[i] == char_to_search) {
@@ -96,8 +96,8 @@ char strops_contains_char(const char* string, char char_to_search) {
     return 0;
 }
 
-char strops_contains_string(const char* string, const char* string_to_search) {
-    char contains_string = 0;
+bool_t strops_contains_string(const char* string, const char* string_to_search) {
+    bool_t contains_string = 0;
     ull_t sts_length = strops_length(string_to_search);
     ull_t l = strops_length(string) - sts_length + 1;
     ull_t i, j;
@@ -116,6 +116,34 @@ char strops_contains_string(const char* string, const char* string_to_search) {
     return contains_string;
 }
 
+bool_t strops_equals(const char* string1, const char* string2) {
+    if (strops_length(string1) != strops_length(string2)) {
+        return 0;
+    }
+    bool_t equal = 1;
+    ull_t i;
+    for (i = 0; i < strops_length(string1); i++) {
+        if (string1[i] != string2[i]) {
+            equal = 0;
+            break;
+        }
+    }
+    return equal;
+}
+
+bool_t strops_starts_with(const char* string1, const char* string2) {
+    assert(strops_length(string1) >= strops_length(string2) && "string2 cannot be longer than string1");
+    bool_t starts_with = 1;
+    ull_t i;
+    for (i = 0; i < strops_length(string2); i++) {
+        if (string1[i] != string2[i]) {
+            starts_with = 0;
+            break;
+        }
+    }
+    return starts_with;
+}
+
 char* strops_to_lowercase(const char* string) {
     char* result = strops_copy(string);
     ull_t i;
@@ -138,7 +166,7 @@ char* strops_to_uppercase(const char* string) {
     return result;
 }
 
-int strops_is_lowercase(const char* string) {
+bool_t strops_is_lowercase(const char* string) {
     ull_t i;
     for (i = 0; i < strops_length(string); i++) {
         if (!(string[i] >= 'a' && string[i] <= 'z')) {
@@ -148,7 +176,7 @@ int strops_is_lowercase(const char* string) {
     return 1;
 }
 
-int strops_is_uppercase(const char* string) {
+bool_t strops_is_uppercase(const char* string) {
     ull_t i;
     for (i = 0; i < strops_length(string); i++) {
         if (!(string[i] >= 'A' && string[i] <= 'Z')) {
diff --git a/strops.h b/strops.h
index 61b070f..76c3c80 100644
--- a/strops.h
+++ b/strops.h
@@ -10,14 +10,24 @@
 */
 
 typedef unsigned long long ull_t;
+typedef unsigned char bool_t;
 
-char contains_char(const char* string, char char_to_search);
-char contains_string(const char* string, const char* string_to_search);
+char* strops_lenght(const char* string);
+char* strops_copy(const char* string);
+char* strops_copy_amount(const char* string, ull_t amount);
+
+ull_t strops_first_pos_of_char(const char* string, char char_to_search);
+ull_t strops_first_pos_of_string(const char* string, const char* string_to_search);
+
+bool_t strops_contains_char(const char* string, char char_to_search);
+bool_t strops_contains_string(const char* string, const char* string_to_search);
+bool_t strops_equals(const char* string1, const char* string2);
+bool_t strops_starts_with(const char* string1, const char* string2);
 
 char* strops_to_lowercase(const char* string);
 char* strops_to_uppercase(const char* string);
-int strops_is_lowercase(const char* string);
-int strops_is_uppercase(const char* string);
+bool_t strops_is_lowercase(const char* string);
+bool_t strops_is_uppercase(const char* string);
 
 char* strops_insert_at_pos_string(const char* string, const char* string_to_insert, ull_t pos);
 char* strops_remove_at_pos_char(const char* string, ull_t pos);
diff --git a/tests.c b/tests.c
index 423790f..678b2c7 100644
--- a/tests.c
+++ b/tests.c
@@ -79,7 +79,7 @@ int test_contains_string() {
     char result;
     input = "I suck at C";
     expected = 1;
-    result = strops_contains_string(input, "C");
+    result = strops_contains_string(input, "suck");
     if (result != expected) {
         printf("test_ failed\n");
         printf("Got = %d\nExpected = %d\n", result, expected);