trimEnd 
Removes trailing whitespace or specified characters from a string.
Signature 
typescript
function trimEnd(str: string, chars?: string | string[]): string;Parameters 
- str(- string): The string from which trailing characters will be trimmed.
- chars(- string | string[]): The character(s) to remove from the end of the string.
Returns 
(string): The resulting string after the specified trailing character has been removed.
Examples 
typescript
const trimmedStr1 = trimEnd('hello---', '-'); // returns 'hello'
const trimmedStr2 = trimEnd('123000', '0'); // returns '123'
const trimmedStr3 = trimEnd('abcabcabc', 'c'); // returns 'abcabcab'
const trimmedStr4 = trimEnd('trimmedxxx', 'x'); // returns 'trimmed'
