The tolower function changes the case of the characters in a string making all characters lowercase.
The C language's to lower () function is used to change the alphabet from uppercase to lowercase. i.e. The tolower() method turns an uppercase alphabet to a lowercase alphabet if the character provided is an uppercase alphabet. Another lowercase letter, a special symbol, or a numeral is unaffected by this function. It is described in the C header file ctype.h.
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