Trim Trailing Spaces from a String

Task

Implement the function trim_end_spaces

• Write a function that takes a char* string that may have trailing spaces and modifies the string in-place so that the first space in the list of trailing spaces is replaced with a null-terminator(\0)
• The function should not return anything; it should modify the input string directly

Function Signature

// Given a char* that may have trailing spaces, change the string to have a null terminator where the first space in the list of trailing spaces starts.
void trim_end_spaces(char* str);

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Example

$ ./trim_end_spaces
a b c    
a b c
hello world   
hello world
test
test
"   "
""
a    b    
a    b

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Code

void trim_end_spaces(char* str) {
    int end = strlen(str) - 1;
    while(end >= 0 && str[end] == ' '){
	    end--;
    }
    str[end + 1] = 0;
}