Complete the C function to find the first occurrence of a character c in a string str and return its index. Return -1 if not found. #include // For strlen, though not strictly needed for this loop int find_char_index(const char* str, char
c) {     int i = 0;     while (str[i] != '\0') {         if (_________ ) { // Line to complete             return i;         }         i++;     }     return -1; }