python delete double white space between columns from txt file and save result in new file

I have txt file 1 has the following contents:

AW_003015.1 156 VPSELGGVGLKNTQYARLVEI AS_010029.1 215 LASGETVAAFKLTEPSSGSDA CE_010039.1 433 SEAAWKVTDEKIQIMGGMGFM RN_000019.1 477 ILRLFVALQGKMDKGKELSGL DP_020039.1 603 HPTAQHEKMLKDTWCIEAAAR

I want to make single line space between columns and save that in new txt file as following:

AW_003015.1 156 VPSELGGVGLKNTQYARLVEI AS_010029.1 215 LASGETVAAFKLTEPSSGSDA CE_010039.1 433 SEAAWKVTDEKIQIMGGMGFM RN_000019.1 477 ILRLFVALQGKMDKGKELSGL DP_020039.1 603 HPTAQHEKMLKDTWCIEAAAR

This is my code I did not be able to do that:

outfile = open("file2.txt", "w") # Clears existing file, open for writing

with open("file1.txt") as infile:

for line in infile:

line = line.strip()

#print(line)

if line:

line = line.strip()

while ' ' in line:

line = line.replace(' ', '')

print(line)

outfile.write(line)