Objective

Implement a function that scans a string and returns the first position whose character appears in a second string.

Steps

• The function receives two null-terminated strings: text and needles.
• Walk through text from left to right.
• Return a pointer to the first character in text that is also present anywhere in needles.
• If no character matches, return NULL.
• If needles is empty, return NULL.
• Do not allocate memory and do not call library search functions.

Objective

Implement a function that scans a string and returns the first position whose character appears in a second string.

Steps

• The function receives two null-terminated strings: text and needles.
• Walk through text from left to right.
• Return a pointer to the first character in text that is also present anywhere in needles.
• If no character matches, return NULL.
• If needles is empty, return NULL.
• Do not allocate memory and do not call library search functions.