when row value matches in 2 columns of data, replace the value in the second column with the value in the first column in r

library(dplyr)

# Create a sample data frame
df <- data.frame(col1 = c("A", "B", "C", "D"),
                 col2 = c("E", "B", "F", "A"))

# Update col2 where col1 and col2 match
df <- df %>%
  mutate(col2 = ifelse(col1 == col2, col1, col2))

df
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