already started, but not done

src/strops.c

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+#include "strops.h"
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#include <stdio.h>
+
+/* Function template
+char* strops_(const char* string) {
+    char *result = malloc(strlen(string));
+    memcpy(result, string, strlen(string));
+    return result;
+}
+*/
+
+char* strops_to_lowercase(const char* string) {
+    char *result = malloc(strlen(string));
+    memcpy(result, string, strlen(string));
+    size_t i;
+    for(i = 0; i < strlen(string); i++) {
+        if (result[i] >= 'A' && result[i] <= 'Z') {
+            result[i] += 32;
+        }
+    }
+    return result;
+}
+
+char* strops_to_uppercase(const char* string) {
+    char *result = malloc(strlen(string));
+    memcpy(result, string, strlen(string));
+    size_t i;
+    for(i = 0; i < strlen(string); i++) {
+        if (result[i] >= 'a' && result[i] <= 'z') {
+            result[i] -= 32;
+        }
+    }
+    return result;
+}
+
+char* strops_remove_at_pos(const char* string, size_t pos) {
+    char *result = malloc(strlen(string));
+    memcpy(result, string, strlen(string));
+    result[pos] = 0;
+    size_t i;
+    for(i = pos; i < strlen(string); i++) {
+        result[i] = result[i + 1];
+    }
+    result = realloc(result, strlen(result));
+    return result;
+}
+
+char* strops_trim_right_whitespace(const char* string) {
+    char *result = malloc(strlen(string));
+    memcpy(result, string, strlen(string));
+    while(strchr("\t\n\v\f\r ", result[strlen(result) - 1]) != NULL) {
+        result = strops_remove_at_pos(result, strlen(result) - 1);
+    }
+    result = realloc(result, strlen(result));
+    return result;
+}
+
+char* strops_trim_left_whitespace(const char* string) {
+    char *result = malloc(strlen(string));
+    memcpy(result, string, strlen(string));
+    while(strchr("\t\n\v\f\r ", result[0]) != NULL) {
+        result = strops_remove_at_pos(result, 0);
+    }
+    result = realloc(result, strlen(result));
+    return result;
+}
+
+char* strops_trim_both_whitespace(const char* string) {
+    char *result = malloc(strlen(string));
+    memcpy(result, string, strlen(string));
+    result = strops_trim_right_whitespace(result);
+    result = strops_trim_left_whitespace(result);
+    return result;
+}