human
Check whether given string can be generated after concatenating given strings | Function that return true if pre is a prefix of str.
While there are characters to match.
If characters differ at any position.
str starts with pre.
Function that return true if suff is a suffix of str.
While there are characters to match.
If characters differ at any position.
str ends with suff.
Function that returns true if str = a + b or str = b + a.
str cannot be generated by concatenating a and b.
If str starts with a i . e . a is a prefix of str.
Check if the rest of the characters are equal to b i . e . b is a suffix of str.
If str starts with b i . e . b is a prefix of str.
Check if the rest of the characters are equal to a i . e . a is a suffix of str.
Driver code"
Solution in Python:

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Can you provide a code to check whether given string can be generated after concatenating given strings and the other steps required?
assistant
#Here is code to check whether given string can be generated after concatenating given strings and the other steps required.
 def startsWith ( str , pre ) :
	strLen = len ( str )
	preLen = len ( pre )
	i = 0
	j = 0
	while ( i < strLen and j < preLen ) :
		if ( str [ i ] != pre [ j ] ) :
			return False
		i += 1
		j += 1
	return True
def endsWith ( str , suff ) :
	i = len ( str ) - 1
	j = len ( suff ) - 1
	while ( i >= 0 and j >= 0 ) :
		if ( str [ i ] != suff [ j ] ) :
			return False
		i -= 1
		j -= 1
	return True
def checkString ( str , a , b ) :
	if ( len ( str ) != len ( a ) + len ( b ) ) :
		return False
	if ( startsWith ( str , a ) ) :
		if ( endsWith ( str , b ) ) :
			return True
	if ( startsWith ( str , b ) ) :
		if ( endsWith ( str , a ) ) :
			return True
	return False
str = " GeeksforGeeks "
a = " Geeksfo "
b = " rGeeks "
if ( checkString ( str , a , b ) ) :
	print ( " Yes " )
else :
	print ( " No " )