def setup():
string = "Thailand"
reference = "land"
replace = "thai"
print(my_replace(string,reference,replace))
def my_replace(string,reference,replace):
newString = ""
i = 0
iRef = 0
iRep = 0
while(i<len(string)):
if(string[i]==reference[iRef]):
a = 0
while(a < len(reference)):
if(reference[iRef]==string[i+iRef]):
iRef+=1
a+=1
else:
newString = newString+string[i]
a = len(reference)
if(iRef==len(reference)):
n = 0
iRep = 0
while(n < len(replace)):
newString = newString+replace[iRep]
iRep +=1
n+=1
i +=len(reference)-1
iRef = 0
else :
if(string[i] != " "):
newString = newString + string[i]
i+=1
return newString
setup()
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