implemented trimLeft

src/userinput.c

@@ -1 +1,15 @@
 #include "userinput.h"
+
+#include <ctype.h>
+#include <stdio.h>
+
+void trimLeft(char *input) {
+    size_t length = strlen(input);
+    int firstIndex = 0;
+    while (firstIndex < length && isspace(input[firstIndex])) {
+        firstIndex++;
+    }
+    for (int i = 0; i <= length - firstIndex; i++) {
+        input[i] = input[firstIndex + i];
+    }
+}