1.5
>>> def txtconcate(txt1,txt2):
'''
This function concate two strings.
(txt1,txt2)->str
>>>txtconcate("Muhammad","is the Last Prohpet")
Muhammad:is the Last Prophet.
'''
print(txt1,txt2,sep=":")
>>> txtconcate("Muhammad","is the Last Prophet")
Muhammad:is the Last Prophet
>>>