rotate x axis title to 90 degress in ggplot in r

main.r
library(ggplot2)
# Example data
df <- data.frame(x = c("A", "B", "C"), y = c(10, 20, 15))

# Create the ggplot with rotated x-axis title
ggplot(df, aes(x, y)) + 
  geom_bar(stat = "identity") +
  theme(axis.text.x = element_text(angle = 90, vjust = 0.5, hjust=1))
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